- Label: Cinchona, Cascarilla amarilla del Rey de Loxa
- Pavon No. 20
- Howard, J. E.†1853†Examination of Pavon's collection of Peruvian barks contained in the British Museum. London: The Author, vi; 47. Howard, J. E. 1862 Illustrations of the Nueva quinologia of Pavon. London: L. Reeve.
- Record posted on March 27, 2009 and last updated March 27, 2009